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#include "GLTexture.hpp"
#include <GL/glew.h>
#include <wx/image.h>
#include <vector>
#include <algorithm>
namespace Slic3r {
namespace GUI {
GLTexture::GLTexture()
: m_id(0)
, m_width(0)
, m_height(0)
, m_source("")
{
}
GLTexture::~GLTexture()
{
reset();
}
bool GLTexture::load_from_file(const std::string& filename, bool generate_mipmaps)
{
reset();
// Load a PNG with an alpha channel.
wxImage image;
if (!image.LoadFile(filename, wxBITMAP_TYPE_PNG))
{
reset();
return false;
}
m_width = image.GetWidth();
m_height = image.GetHeight();
int n_pixels = m_width * m_height;
if (n_pixels <= 0)
{
reset();
return false;
}
// Get RGB & alpha raw data from wxImage, pack them into an array.
unsigned char* img_rgb = image.GetData();
if (img_rgb == nullptr)
{
reset();
return false;
}
unsigned char* img_alpha = image.GetAlpha();
std::vector<unsigned char> data(n_pixels * 4, 0);
for (int i = 0; i < n_pixels; ++i)
{
int data_id = i * 4;
int img_id = i * 3;
data[data_id + 0] = img_rgb[img_id + 0];
data[data_id + 1] = img_rgb[img_id + 1];
data[data_id + 2] = img_rgb[img_id + 2];
data[data_id + 3] = (img_alpha != nullptr) ? img_alpha[i] : 255;
}
// sends data to gpu
::glGenTextures(1, &m_id);
::glBindTexture(GL_TEXTURE_2D, m_id);
::glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, (GLsizei)m_width, (GLsizei)m_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, (const void*)data.data());
if (generate_mipmaps)
{
// we manually generate mipmaps because glGenerateMipmap() function is not reliable on all graphics cards
_generate_mipmaps(image);
::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
}
else
{
::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 1);
}
::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
::glBindTexture(GL_TEXTURE_2D, 0);
m_source = filename;
return true;
}
void GLTexture::reset()
{
if (m_id != 0)
::glDeleteTextures(1, &m_id);
m_id = 0;
m_width = 0;
m_height = 0;
m_source = "";
}
unsigned int GLTexture::get_id() const
{
return m_id;
}
int GLTexture::get_width() const
{
return m_width;
}
int GLTexture::get_height() const
{
return m_height;
}
const std::string& GLTexture::get_source() const
{
return m_source;
}
void GLTexture::render_texture(unsigned int tex_id, float left, float right, float bottom, float top)
{
::glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
::glDisable(GL_LIGHTING);
::glEnable(GL_BLEND);
::glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
::glEnable(GL_TEXTURE_2D);
::glBindTexture(GL_TEXTURE_2D, (GLuint)tex_id);
::glBegin(GL_QUADS);
::glTexCoord2d(0.0f, 1.0f); ::glVertex3f(left, bottom, 0.0f);
::glTexCoord2d(1.0f, 1.0f); ::glVertex3f(right, bottom, 0.0f);
::glTexCoord2d(1.0f, 0.0f); ::glVertex3f(right, top, 0.0f);
::glTexCoord2d(0.0f, 0.0f); ::glVertex3f(left, top, 0.0f);
::glEnd();
::glBindTexture(GL_TEXTURE_2D, 0);
::glDisable(GL_TEXTURE_2D);
::glDisable(GL_BLEND);
::glEnable(GL_LIGHTING);
}
void GLTexture::_generate_mipmaps(wxImage& image)
{
int w = image.GetWidth();
int h = image.GetHeight();
GLint level = 0;
std::vector<unsigned char> data(w * h * 4, 0);
while ((w > 1) && (h > 1))
{
++level;
w = std::max(w / 2, 1);
h = std::max(h / 2, 1);
int n_pixels = w * h;
image = image.ResampleBicubic(w, h);
unsigned char* img_rgb = image.GetData();
unsigned char* img_alpha = image.GetAlpha();
data.resize(n_pixels * 4);
for (int i = 0; i < n_pixels; ++i)
{
int data_id = i * 4;
int img_id = i * 3;
data[data_id + 0] = img_rgb[img_id + 0];
data[data_id + 1] = img_rgb[img_id + 1];
data[data_id + 2] = img_rgb[img_id + 2];
data[data_id + 3] = (img_alpha != nullptr) ? img_alpha[i] : 255;
}
::glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA8, (GLsizei)w, (GLsizei)h, 0, GL_RGBA, GL_UNSIGNED_BYTE, (const void*)data.data());
}
}
} // namespace GUI
} // namespace Slic3r
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